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You can trace the outlines and produce an exact or almost exact copy, and that's what Ariel actually is.

How is tracing a published work not considered copying?

I'm not a lawyer so I couldn't say. But apparently that's how it works when it comes to fonts.

Because it's letters of the alphabet, and you can't copyright them or their shape.

The small modification you make to the shape are not considered enough to give you copyright.